The only control for the heat on the economy heater was the fan switch. Worked because there was no fresh air flowing through the heater. There is a valve that can be installed on the engine output to shut off the heater in the summer.
Right side Here's a pic of the original horn on my 52.
Left side And the heater was an option. Our neighbor bought a new 59 Fored 1/2 ton and was surprised when dad asked him why he bought a truck without a heater in Kansas.
